Machine for manipulating foundry-molds.



PATENTED AFR. 24, 1906;

P. BONVILLAIN.

MACHINE FOR MANIPULATING FOUNDRY MOLDS.

APPLIGATION FILED JULY 29, 1904.

4 SHEETS-SHEET 1.

PATBNTED APR. 24, 1906.

Pl BONVILLAIN. MACHINE FOR MANIPULATING FOUNDRY MOLDS.

APPLICATION FILED JULY 29, 1904. I

4 SHEETS-SHEET 2.

MP W

No 818,410. PATENTBD APR. 24, 1906.

P. BONVILLAIN.

MAGHINE FOR MANIPULATING FOUNDRY MOLDS.v

APPLIOATION FILED JULY 29, 1904.

4 SHEETS-SHEET 3.

No. 818,410. PATENTED APR. 24, 1906. P. BONVILLAIN.

MACHINE FOR MANIPULATING FOUNDRY MOLDS.

APPLICATION FILED JULY 29, 1004.

4 SHEETS-SHBET 4.

my o M NTTFD STATES PATENT GFF MACHINE FOR MANIPULATING FOUNDRY-MOLDS.

Specification of Letters Patent.

Patented April 24, 1906.

Application filed July 29, 1904. Serial No. 218,628.

To aZZ whom it may concern.-

Be it known that I, PHILIBERT BoNvIL- LAIN, a citizen of the Republic ofFrance, and a resident of Paris, France, have invented .certain new anduseful Improvements in or Relating to Machines for ManipulatingFoundry-Molds and the Like, of which the following is a specification.

This invention relates to a special machine for assembling two or moreparts of the same moldingbox, forming asand mold made either by hand orby machine-molding processes so that they superpose each other perfectlyaccurately in order to avoid side displacement in the parts of the moldwhich would alter more or less the shape of the castings.

This said machine is so devised as to allow at the same operation thepushing out from the molding-box of the blocks of sand formed by theassembled parts of a same mold, so that the same molding-box can bereutilized indefinitely to make similar molds, which constitutes anenormous saving in foundry practice.

In the annexed drawings, Figure 1 is a front view of the machine,showing the base of the machine in section and a View of the pushinghydraulic ram and table. Figs. 2 and 3 are respectively a side elevationand a ground plan of same machine. Fig. 2 is a side elevation ofmechanism for automatically controlling the water. Fig. 4 is a plan ofone form of rectangular molding-box to be used on the machine. Fig. 5 isa plan of a modified form of rectangular molding-box. Fig. 6 is a planof one form of a circular molding-box to be used on the machine. Fig. 7is a plan of another form of circular moldingbox. Fig. 8 is a sectionalelevation showing the manner of locating the lower section of themolding-box. Fig. 9 is a similar view showing the first section of themolding-box lowered in position. Fig. 10 is a similar view showing thetwo sections of the molding-box before they are brought together. Fig.11 is a similar view showing the two sections of the molding-box united.Fig. 12 is a similar view showing the arrangement for discharging thecontents of the-molding-box. Fig. 13 is a similar view showing thecontents of the molding-box forced up or out. Fig. 14 is a plan andhorizontal section showing spring-pincers which may be used for holdingthe empty molding-boxes in elevated position on the studs. Fig. 15 is asectional elevation of the machine, showing the special device by meansof which emptied moldingboxes are brought back to the top of themachine, whence they are easily picked up -to be again used for anothermold.

The molding-boxes 16, preferably used in this machine, bear two holes 1717, drilled in flanges or side projections at a given distance alwaysthe same. The shape of these molding boxes or flasks may vary accordingto the shape of the pattern; but each of them must carry on each side ofthese two holes 17 dissymmetric projections 18 and 19, as shown in Fig.4, the use of which will be explained later on.

The assembling-machine comprises, Figs. 1, 2, and 3, a foundation-plate20, on the center of which is fixed a hydraulic cylinder 21. At bothsides of this foundation-plate are fixed two movable uprights 22,carrying in their centers long vertical studs or rods 23, on which partsof a molding-box containing a mold are engaged. These long studs must beperfectly parallel to each and to the axis of the hydraulic cylinder 21and be in a ver tical plane passing through that axis. Each upright 22carries besides two seats 24 and 25, dissymmetric and arranged exactlyas the aforesaid projecting parts 18 and 19 of the mold-boxes. Theseseats 24 and 25 are arranged so as to permit the projections 18 and 19of the mold-boxes 16 to pass when these are engaged upon the studs 23through their openings 17 with their parting-face upward; but when themold-box 16 is engaged upon the studs 23 with its parting-face downwardthe projections 18 and 19 meet the seats 24 and 25 of the machine, uponwhich they rest. The dissymmetry of the projections and seats issufficient to accomplish this result.

The hydraulic cylinder 21 carries a ram 26, the top part 27 of which isof a smaller diame ter and screwed on a certain length. The shoulder 28has for object to prevent the hydraulic ram from rising above a certainpoint in the striking-socket 29, which at the same time forms a guidefor the part 27 of the ram. The screwed part 27 of the hydraulic rambears a nut 30, which is raised or lowered to allow of the limitation ofthe downstroke of the ram. The ram 26 also carries on its top a table31, on which the molds are laid.

Working of the Machine.

Assembling parts of a m0Z0Z.-The ram 25 being in the position shown inFig. 8, the lower part of the mold in the molding-frame 16 is brought upand laid on the table 31, with its parting-face upward, holes 17 17engaging long studs 23 23. This being done, let therarn get down tillthe nut 30 rests upon socket 29. The molding-frame and the mold 16 follow, guided by the long studs 23. Then take upper part of the mold inthe molding-box 16 and place it on the machine-joint face downward, theholes 17 17 engaging the long studs 23 23. In that position the upperpart of the mold cannot get through, for its dissymmetric projections 18and 19 rest on the seats 24 and 25, Fig. 10. Thus placed both parts ofthe mold are accurately disposed one above the other, their axis beingin the plane passing through the axis of the ram 26 and long studs 2323.

perfectly true against top part, the mold is assembled, Fig. 11, and hasonly to be taken away to have metal poured in.

Each support 22 is furnished at its upper part with a bolt 32, fitted inahorizontal opening in the support and jointed to an operating-lever 33,which latter is jointed upon the support 22. The bolts 32 serve toengage the ears 18 of the upper frame, Figs. 12 and 13, when this frameis so placed that the ears 18 and 19 rest, respectively, upon the seats25 and 29 for unloading the frame, (removing the sand,) in consequenceof which the upper frame is then fixed and cannot be raised or lowered.The lower part of the mold or lower frame is then raised as forassembling, and when parts of mold are in contact the ram is made torise farther up, thus forcing the block of sand out of the molding-box,Fig. 13.

In pushing the mold or block of sand out of the molding-box when thetable 31 escapes the lower frame this frame being set free tends to falldown, Fig. 15, and to prevent it doing so an automatic device has beenprovided. This device consists mainly in balance-weights 37, fixed atthe end of,small wire ropes 38 passing round grooved pulleys 39, thesewire ropes being tied at their other ends to vertically-guided rods 40,the tops of which, engaging flanges 17 of the lower frame, by the actionof the balance-weights exert a pressure under the flanges and hold thislower frame against the top one. The machine carries an arrangementsimilar on each side, as is represented in Fig. 1 5, and thecounterweights 37 are regulated so that their total weight should begreater than that of the mold-box 16 when it is empty, but also so thatit should be less than this same mold-box when it is full of sand. Bythis means when the lower mold-box 16 full of sand is placed upon themachine so that its ears rest upon the rods 40 it descends upon theplate 31 and carries the weights 37; but when after molding the mold-box16 has been emptied these weights Then if the ram 26 is caused to risethe lower part of the mold is brought 37, heavier than it, maintain itelevated and prevent it falling, and this is automatically accomplished.The same object can also be attained by means of the following device,which is much simpler, but not automatic. On each pin 23 can be mountedspring-pincers, Fig. 14, constituted by two arms 35 35, hinged togetherand having a spring 36 placed between their ends, so that the saidspring has always the tendency to move the said ends apart, and thus tobring together the opposite ends on the corresponding pins 23. While thelower flask is being raised, the pincers are placed on the pins 23 bycausing them to follow the lugs of the said flask, and as soon as theerecting or fitting together has been completed the pincers are left tothemselves. By the expansion of the spring, which is fairly strong, theempty flask is held and cannot descend. Besides the shoulder 28preventing the ram 26 from getting out of the hydraulic cylinder 21 aspecial device has been provided to limit its stroke according to theheight of moldingbox 16 16 used in order to save water under pressure.To that effect table 30 carries a vertical rod 41, having a movablesocket 42, adjustable. In its way up as soon as the parts of the moldare assembled or as soon as the table 30 escapes the top of the upperframe in extracting or pushing out the block of sand forming the moldthe socket 42 strikes a lever 44, keyed on a shaft 45 of a cam 46, whichcommands the inlet-valve and closes it automatically. This device saveswater under pressure and limits the expenses to the strict minimum. Tobring down the ram .26 and the table 31, it suffices to pull a lever 47,opening the exhaust.

Having now particularly described and ascertainedthe nature of my saidinvention and in what manner the same is to be performed, I declare thatwhat I claim is 1. Inamachine for assembling and for emptyingfoundry-flasks, the combination with a horizontal plate movable betweenthe uprights of a frame, of two vertical rods fixed upon the said frame,dissymmetric seats on each side of said rods upon the said uprights, ahydraulic piston carrying the said horizontal plate, means for limitingthe ascending and descending travel of the said piston, and means forretaining the lower mold-box after it has been emptied, substantially asabove described and for the object specified.

2. In a machine for assembling and emptying foundry-flasks, thecombination with a horizontal plate movable between the uprights of aframe, of two vertical rods fixed upon the said frame, dissymmetricseats on each side of said rods upon the said uprights, a hydraulicpiston having a head carrying the said horizontal plate, a cylinder forthis piston, a socket closing this cylinder to guide the piston andserve as a seat for its head, a screw-nut upon the said piston below thehorizontal plate, a rod fixed vertically under the said plate, a movablestop upon this rod, a conduit for water under pressure having anoperating-lever controlled by said stop, and means for retaining thelower mold-box after it has been emptied, substantially as abovedescribed and for the object specified.

3. In a machine for assembling and empty ing foundry-flasks, thecombination with a horizontal plate movable between the uprights of aframe, of two vertical rods fixed upon the said frame, dissymmetricseats on each side of said rods upon the said uprights, vertical rodsguided on the exterior of the uprights, weights connected with theserods by cables, and grooved pulleys for carrying said cables,substantially as before described and for the object specified.

4. In a machine of the character herein set forth, lateral rods anddissymmetric seats, a mold-box having diametrically opposite ears withholes for admitting the lateral rods of the machine, and projectionsdisposed dissymmetrically on each side of said ears and correspondingwith the dissymmetric seats of the machine, combined substantially asabove described and for the object specified.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

v PI-IILIBERT BONVILLAIN.

Witnesses:

HANsoN 0. 002m, PAUL BACARD.

